Must tickets booked in advance be put on at scheduled departure time?

You need to enter at a designated time, for example if you renew it from 8:30 am to 12 pm, then you need to enter during this period. But the departure is unlimited.
You need to enter within the specified time, for example if your renewed access is from 8:30 am to 12 pm, you should enter during this period. However, there’s no limit on exit times.